A topic in the Open Knowledge Graph — a free, open map of 15,290 topics and the order to learn them in.
Harmonizing a melody means selecting chords that support each melodic pitch while forming a coherent, expressive harmonic progression. The melody note may function as the root, third, fifth, or a non-chord tone (passing tone, neighbor tone, suspension) of each chosen chord, giving the composer multiple viable harmonizations for any given note. Choosing among these options requires weighing melodic accent, harmonic rhythm, voice-leading smoothness, and formal function.
Take a simple eight-measure melody and write out three distinct harmonizations using different chord choices; compare how each version changes the emotional character and phrase direction.
You already know from Roman numeral analysis how to identify what chord is sounding and how to label non-chord tones — passing tones, neighbor tones, suspensions. Melodic harmonization reverses that analytical process: instead of being given the chords and asked what they are, you are given the melody and asked to choose the chords. The core insight is that most melody notes are ambiguous — the pitch C in C major could belong to I, iii, vi, IV, or even V/IV. The harmonizer's job is to resolve that ambiguity in a way that serves the phrase's direction and emotional character.
Start by identifying the structural tones in the melody — the notes that fall on strong beats or are held longest. These are your anchors: strong-beat melody notes most naturally sound as chord tones (root, third, or fifth) of whatever chord you place beneath them. Weaker-beat notes can be non-chord tones — passing tones moving between chord tones, neighbor tones that decorate a chord tone and return to it, or suspensions that delay the resolution of a preceding consonance. The skill of recognizing non-chord tones from your theory studies is now a compositional tool: knowing a weak-beat note can be a passing tone gives you the freedom to hold the underlying chord across it, rather than scrambling to find a chord that contains every note.
Harmonic rhythm — the rate at which chords change — is perhaps the most expressive lever in harmonization. A melody harmonized with one chord per beat feels driven and dense; the same melody with one chord per measure feels spacious and inevitable. Typically, phrase beginnings have slower harmonic rhythm (one or two chords establish the key), the middle accelerates (more chord changes create motion toward the cadence), and the cadence itself can slow again as the final chord is approached and confirmed. When you wrote harmonizations in theory class, you may have habitually changed chords on every beat — resist this. Holding a chord across a non-chord tone is nearly always more graceful.
The most important moment in any phrase is the cadence, where the harmonic motion arrives at a point of rest or questioning. An authentic cadence (V–I) creates closure; a half cadence (ending on V) creates an expectant pause; a deceptive cadence (V–vi) creates surprise. Build your harmonization backward from the cadence you want: decide whether the phrase will close, pause, or swerve, then work backward to support that ending. A phrase that ends on a half cadence often needs a dominant pedal or a clear approach chord (like ii or IV leading to V) to signal the arrival. The interior choices — which chord serves each structural melody note — then fill in the path between opening and cadence. This end-directed thinking is what separates deliberate harmonization from note-by-note chord guessing.
Topics in reflective domains aren't scored by quiz answers. Read, reflect, and mark when you've thought it through.